diff --git a/docs/_docs/includes/cpp-prerequisites.adoc b/docs/_docs/includes/cpp-prerequisites.adoc
index 88da890917b9a..a513d573e7ba4 100644
--- a/docs/_docs/includes/cpp-prerequisites.adoc
+++ b/docs/_docs/includes/cpp-prerequisites.adoc
@@ -14,7 +14,7 @@
 // limitations under the License.
 [width="100%",cols="1,3"]
 |===
-|JDK|Oracle JDK 17, Open JDK 17, IBM JDK 17
+|JDK|Oracle JDK, OpenJDK, IBM JDK: versions 17 and 21. Java 17 is the minimum required version.
 |OS|Windows Vista, Windows Server 2008 and later versions, Ubuntu (18.04 64 bit)
 |Network|No restrictions (10G recommended)
 |Hardware|No restrictions
diff --git a/docs/_docs/includes/dotnet-prerequisites.adoc b/docs/_docs/includes/dotnet-prerequisites.adoc
index 82b9eb9f97351..0b7487903d9b1 100644
--- a/docs/_docs/includes/dotnet-prerequisites.adoc
+++ b/docs/_docs/includes/dotnet-prerequisites.adoc
@@ -14,7 +14,7 @@
 // limitations under the License.
 [width="100%",cols="1,3"]
 |===
-|JDK |Oracle JDK 17, Open JDK 17, IBM JDK 17
+|JDK |Oracle JDK, OpenJDK, IBM JDK: versions 17 and 21. Java 17 is the minimum required version.
 |.NET Framework |.NET 4.0+, .NET Core 2.0+
 //|IDE |Visual Studio 2010+, Rider, Visual Studio Code
 |===
diff --git a/docs/_docs/includes/java.adoc b/docs/_docs/includes/java.adoc
index 84a55f89f55ee..87088bba7a991 100644
--- a/docs/_docs/includes/java.adoc
+++ b/docs/_docs/includes/java.adoc
@@ -13,6 +13,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+Ignite requires Java 17 or later. Java 17 and Java 21 are supported. Earlier Java versions are not supported:
+the start-up scripts refuse to run on them.
+
 To run Ignite with Java 17 or later, follow these steps:
 
 1.  Set the `JAVA_HOME` environment variable to point to the Java installation
@@ -26,7 +29,7 @@ application:
 +
 [tabs]
 --
-tab:Java 17[]
+tab:Java 17 and 21[]
 [source,shell]
 ----
 --add-opens=java.base/jdk.internal.access=ALL-UNNAMED
diff --git a/docs/_docs/includes/prereqs.adoc b/docs/_docs/includes/prereqs.adoc
index 9bcd77464f749..0774d2f867e7c 100644
--- a/docs/_docs/includes/prereqs.adoc
+++ b/docs/_docs/includes/prereqs.adoc
@@ -14,7 +14,7 @@
 // limitations under the License.
 [width="100%",cols="1,3"]
 |===
-|JDK |Oracle JDK 17, Open JDK 17, IBM JDK 17
+|JDK |Oracle JDK, OpenJDK, IBM JDK: versions 17 and 21. Java 17 is the minimum required version.
 |OS |Linux (any flavor), Mac OSX (10.6 and up), Windows (XP and up),
 Windows Server (2008 and up), Oracle Solaris
 |ISA |x86, x64, SPARC, PowerPC, ARM64
diff --git a/docs/_docs/net-specific/net-cross-platform-support.adoc b/docs/_docs/net-specific/net-cross-platform-support.adoc
index 436789c096589..5dae3f6c47419 100644
--- a/docs/_docs/net-specific/net-cross-platform-support.adoc
+++ b/docs/_docs/net-specific/net-cross-platform-support.adoc
@@ -24,7 +24,7 @@ applications for Linux and macOS, as well as Windows.
 *Requirements:*
 
 * https://www.microsoft.com/net/download/[.NET Core SDK 2.0+, window=_blank]
-* http://www.oracle.com/technetwork/java/javase/downloads/index.html[Java 17+, window=_blank] (macOS requires JDK, otherwise JRE works)
+* http://www.oracle.com/technetwork/java/javase/downloads/index.html[Java 17 or 21, window=_blank] (macOS requires JDK, otherwise JRE works)
 
 *Running Examples*
 https://ignite.apache.org/download.cgi#binaries[Binary distribution, window=_blank] includes .NET Core examples: