Clarify documentation

1 files changed, 3 insertions, 3 deletions

diff --git a/doc/api_ref/ffi.rst b/doc/api_ref/ffi.rst
index 4bf03a5b1..bec0f5503 100644
--- a/doc/api_ref/ffi.rst
+++ b/doc/api_ref/ffi.rst
@@ -66,8 +66,8 @@ The following enum values are defined in the FFI header:
 
    .. note::
 
-      If the environment variable ``BOTAN_FFI_PRINT_EXCEPTIONS`` is
-      set, then any exception which is caught by the FFI layer will
+      If the environment variable ``BOTAN_FFI_PRINT_EXCEPTIONS`` is set to any
+      non-empty value, then any exception which is caught by the FFI layer will
       first print the exception message to stderr before returning an
       error. This is sometimes useful for debugging.
 
@@ -1199,4 +1199,4 @@ X.509 Certificate Revocation Lists
 .. cpp:function:: int botan_x509_is_revoked(botan_x509_crl_t crl, botan_x509_cert_t cert)
 
    Check whether a given ``crl`` contains a given ``cert``.
-   Return ``0`` when the certificate is revoked, ``-1`` otherwise.
\ No newline at end of file
+   Return ``0`` when the certificate is revoked, ``-1`` otherwise.