diff --git a/R/structural-properties.R b/R/structural-properties.R
index daafe94683a..44fc17fc583 100644
--- a/R/structural-properties.R
+++ b/R/structural-properties.R
@@ -1937,7 +1937,7 @@ feedback_vertex_set <- feedback_vertex_set_impl
 #'   for undirected circles anyway.
 #' @param circle Logical scalar, whether to return the shortest circle itself.
 #' @return A named list with two components: \item{girth}{Integer constant, the
-#'   girth of the graph, or 0 if the graph is acyclic.} \item{circle}{Numeric
+#'   girth of the graph, or `Inf` if the graph is acyclic.} \item{circle}{Numeric
 #'   vector with the vertex ids in the shortest circle.}
 #' @author Gabor Csardi \email{csardi.gabor@@gmail.com}
 #' @references Alon Itai and Michael Rodeh: Finding a minimum circuit in a
diff --git a/man/girth.Rd b/man/girth.Rd
index 2510fb6a048..5cf0e041b91 100644
--- a/man/girth.Rd
+++ b/man/girth.Rd
@@ -14,7 +14,7 @@ for undirected circles anyway.}
 }
 \value{
 A named list with two components: \item{girth}{Integer constant, the
-girth of the graph, or 0 if the graph is acyclic.} \item{circle}{Numeric
+girth of the graph, or \code{Inf} if the graph is acyclic.} \item{circle}{Numeric
 vector with the vertex ids in the shortest circle.}
 }
 \description{