diff --git a/gitbook/admin.md b/gitbook/admin.md
index 001129f7..7b7fb4ff 100644
--- a/gitbook/admin.md
+++ b/gitbook/admin.md
@@ -21,6 +21,7 @@ installed on your system:
 ```
 apt-get install libcurl4-openssl-dev
 apt-get install libsodium-dev
+apt-get install help2man
 ```
 Note: On debian jessie you have to use jessie-backports for libsodium-dev.
 
@@ -28,6 +29,7 @@ Note: On debian jessie you have to use jessie-backports for libsodium-dev.
 ```
 yum install libcurl-devel
 yum install libsodium-devel
+yum install help2man
 ```
 
 #### Build oidc-agent