diff --git a/docs.it4i/general/obtaining-login-credentials/obtaining-login-credentials.md b/docs.it4i/general/obtaining-login-credentials/obtaining-login-credentials.md
index 81451a73602deef0e0b3898016f0f7daf8fecfef..561bc9fed087e89dbcbe30f144a6a0d76ceb27e1 100644
--- a/docs.it4i/general/obtaining-login-credentials/obtaining-login-credentials.md
+++ b/docs.it4i/general/obtaining-login-credentials/obtaining-login-credentials.md
@@ -112,6 +112,10 @@ Once authorized by a PI, every person (PI or collaborator) wishing to access the
 1. Statement that you have read and accepted the [Acceptable use policy document][c] (AUP).
 1. Attach the AUP file.
 1. Your preferred username (3 to 12 characters). The preferred username must associate with your first and last name or be otherwise derived from it. Only alphanumeric sequences and dash signs are allowed.
+
+!!! important
+    CESNET, CERIT-SC, and IT4I infrastructures will operate a joint e-INFRA CZ infrastructure. If you have a CESNET (e.g. MetaCentrum, DÚ) or CERIT-SC account, make sure to choose the same login name for your IT4I account to have uniform access to all services in the future.
+
 1. In case you choose an [Alternative way to personal certificate][3], a **scan of photo ID** (personal ID or passport or driver license) is required.
 
 !!! warning