diff --git a/docs/source/commands/peerchannel.md b/docs/source/commands/peerchannel.md
index 2a99d0d0708..26aa83b4fca 100644
--- a/docs/source/commands/peerchannel.md
+++ b/docs/source/commands/peerchannel.md
@@ -57,7 +57,7 @@ Usage:
   peer channel create [flags]
 
 Flags:
-  -c, --channelID string     In case of a newChain command, the channel ID to create.
+  -c, --channelID string     In case of a newChain command, the channel ID to create. It must be all lower case, less than 250 characters long and match the regular expression: [a-z][a-z0-9.-]*
   -f, --file string          Configuration transaction file generated by a tool such as configtxgen for submitting to orderer
   -h, --help                 help for create
       --outputBlock string   The path to write the genesis block for the channel. (default ./<channelID>.block)
@@ -83,7 +83,7 @@ Usage:
   peer channel fetch <newest|oldest|config|(number)> [outputfile] [flags]
 
 Flags:
-  -c, --channelID string   In case of a newChain command, the channel ID to create.
+  -c, --channelID string   In case of a newChain command, the channel ID to create. It must be all lower case, less than 250 characters long and match the regular expression: [a-z][a-z0-9.-]*
   -h, --help               help for fetch
 
 Global Flags:
@@ -106,7 +106,7 @@ Usage:
   peer channel getinfo [flags]
 
 Flags:
-  -c, --channelID string   In case of a newChain command, the channel ID to create.
+  -c, --channelID string   In case of a newChain command, the channel ID to create. It must be all lower case, less than 250 characters long and match the regular expression: [a-z][a-z0-9.-]*
   -h, --help               help for getinfo
 
 Global Flags:
@@ -197,7 +197,7 @@ Usage:
   peer channel update [flags]
 
 Flags:
-  -c, --channelID string   In case of a newChain command, the channel ID to create.
+  -c, --channelID string   In case of a newChain command, the channel ID to create. It must be all lower case, less than 250 characters long and match the regular expression: [a-z][a-z0-9.-]*
   -f, --file string        Configuration transaction file generated by a tool such as configtxgen for submitting to orderer
   -h, --help               help for update