diff --git a/src/main/java/io/reactivex/Completable.java b/src/main/java/io/reactivex/Completable.java
index 6cf5aa75f4..430440b248 100644
--- a/src/main/java/io/reactivex/Completable.java
+++ b/src/main/java/io/reactivex/Completable.java
@@ -396,6 +396,13 @@ public static Completable error(final Throwable error) {
*
* - Scheduler:
* - {@code fromAction} does not operate by default on a particular {@link Scheduler}.
+ * - Error handling:
+ * - If the {@link Action} throws an exception, the respective {@link Throwable} is
+ * delivered to the downstream via {@link CompletableObserver#onError(Throwable)},
+ * except when the downstream has disposed this {@code Completable} source.
+ * In this latter case, the {@code Throwable} is delivered to the global error handler via
+ * {@link RxJavaPlugins#onError(Throwable)} as an {@link io.reactivex.exceptions.UndeliverableException UndeliverableException}.
+ *
*
* @param run the runnable to run for each subscriber
* @return the new Completable instance
@@ -416,6 +423,13 @@ public static Completable fromAction(final Action run) {
*
* - Scheduler:
* - {@code fromCallable} does not operate by default on a particular {@link Scheduler}.
+ * - Error handling:
+ * - If the {@link Callable} throws an exception, the respective {@link Throwable} is
+ * delivered to the downstream via {@link CompletableObserver#onError(Throwable)},
+ * except when the downstream has disposed this {@code Completable} source.
+ * In this latter case, the {@code Throwable} is delivered to the global error handler via
+ * {@link RxJavaPlugins#onError(Throwable)} as an {@link io.reactivex.exceptions.UndeliverableException UndeliverableException}.
+ *
*
* @param callable the callable instance to execute for each subscriber
* @return the new Completable instance
diff --git a/src/main/java/io/reactivex/Flowable.java b/src/main/java/io/reactivex/Flowable.java
index bab8443357..549166dfac 100644
--- a/src/main/java/io/reactivex/Flowable.java
+++ b/src/main/java/io/reactivex/Flowable.java
@@ -1955,6 +1955,13 @@ public static Flowable fromArray(T... items) {
* The operator honors backpressure from downstream.
* Scheduler:
* {@code fromCallable} does not operate by default on a particular {@link Scheduler}.
+ * Error handling:
+ * If the {@link Callable} throws an exception, the respective {@link Throwable} is
+ * delivered to the downstream via {@link Subscriber#onError(Throwable)},
+ * except when the downstream has canceled this {@code Flowable} source.
+ * In this latter case, the {@code Throwable} is delivered to the global error handler via
+ * {@link RxJavaPlugins#onError(Throwable)} as an {@link io.reactivex.exceptions.UndeliverableException UndeliverableException}.
+ *
*
*
* @param supplier
diff --git a/src/main/java/io/reactivex/Maybe.java b/src/main/java/io/reactivex/Maybe.java
index 8750c83cd2..be9c888762 100644
--- a/src/main/java/io/reactivex/Maybe.java
+++ b/src/main/java/io/reactivex/Maybe.java
@@ -657,6 +657,13 @@ public static Maybe error(Callable supplier) {
*
* - Scheduler:
* - {@code fromAction} does not operate by default on a particular {@link Scheduler}.
+ * - Error handling:
+ * - If the {@link Action} throws an exception, the respective {@link Throwable} is
+ * delivered to the downstream via {@link MaybeObserver#onError(Throwable)},
+ * except when the downstream has disposed this {@code Maybe} source.
+ * In this latter case, the {@code Throwable} is delivered to the global error handler via
+ * {@link RxJavaPlugins#onError(Throwable)} as an {@link io.reactivex.exceptions.UndeliverableException UndeliverableException}.
+ *
*
* @param the target type
* @param run the runnable to run for each subscriber
diff --git a/src/main/java/io/reactivex/Observable.java b/src/main/java/io/reactivex/Observable.java
index d1adc46efa..541c15215c 100644
--- a/src/main/java/io/reactivex/Observable.java
+++ b/src/main/java/io/reactivex/Observable.java
@@ -1757,8 +1757,14 @@ public static Observable fromArray(T... items) {
*
* - Scheduler:
* - {@code fromCallable} does not operate by default on a particular {@link Scheduler}.
+ * - Error handling:
+ * - If the {@link Callable} throws an exception, the respective {@link Throwable} is
+ * delivered to the downstream via {@link Observer#onError(Throwable)},
+ * except when the downstream has disposed this {@code Observable} source.
+ * In this latter case, the {@code Throwable} is delivered to the global error handler via
+ * {@link RxJavaPlugins#onError(Throwable)} as an {@link io.reactivex.exceptions.UndeliverableException UndeliverableException}.
+ *
*
- *
* @param supplier
* a function, the execution of which should be deferred; {@code fromCallable} will invoke this
* function only when an observer subscribes to the ObservableSource that {@code fromCallable} returns
diff --git a/src/main/java/io/reactivex/Single.java b/src/main/java/io/reactivex/Single.java
index 51a896c887..dca4eb9ed0 100644
--- a/src/main/java/io/reactivex/Single.java
+++ b/src/main/java/io/reactivex/Single.java
@@ -583,6 +583,13 @@ public static Single error(final Throwable exception) {
*
* - Scheduler:
* - {@code fromCallable} does not operate by default on a particular {@link Scheduler}.
+ * - Error handling:
+ * - If the {@link Callable} throws an exception, the respective {@link Throwable} is
+ * delivered to the downstream via {@link SingleObserver#onError(Throwable)},
+ * except when the downstream has disposed this {@code Single} source.
+ * In this latter case, the {@code Throwable} is delivered to the global error handler via
+ * {@link RxJavaPlugins#onError(Throwable)} as an {@link io.reactivex.exceptions.UndeliverableException UndeliverableException}.
+ *
*
*
* @param callable