diff --git a/doc/man/task.1.in b/doc/man/task.1.in
index da91012d0..9bfb9972c 100644
--- a/doc/man/task.1.in
+++ b/doc/man/task.1.in
@@ -239,11 +239,17 @@ Modifies the existing task with provided information.
 Performs one substitution on task description and annotation for fixing
 mistakes.
 
+If either 'from' or 'to' contain spaces, you will need to put quotes around
+the whole thing.
+
 .TP
 .B ID /from/to/g
 Performs all substitutions on task description and annotation for fixing
 mistakes.
 
+If either 'from' or 'to' contain spaces, you will need to put quotes around
+the whole thing.
+
 .TP
 .B edit ID
 Launches an editor to let you modify all aspects of a task directly.