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-rw-r--r--doc/grep.in.11
1 files changed, 1 insertions, 0 deletions
diff --git a/doc/grep.in.1 b/doc/grep.in.1
index 48c49ef0..4ced95f3 100644
--- a/doc/grep.in.1
+++ b/doc/grep.in.1
@@ -810,6 +810,7 @@ bracket expressions, as follows.
Their names are self explanatory, and they are
.BR [:alnum:] ,
.BR [:alpha:] ,
+.BR [:blank:] ,
.BR [:cntrl:] ,
.BR [:digit:] ,
.BR [:graph:] ,